【element】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.10.1.js'></script>
<style type='text/css'>
li {
width: 100px;
height: 100px;
border: solid;
}
</style>
<script type='text/javascript'>
$(window).load(function(){
$('body').on('click', '.button', function (e) {
console.log($(this).index());
});
});
</script>
</head>
<body>
<ul>
<li class="button">0</li>
<li class="button">1</li>
<li class="button">2</li>
</ul>
</body>
</html>
